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In a workshop a worker measures the leng...

In a workshop a worker measures the length of a steel plate with a Vernier callipers having a least count 0.01 cm. Four such measurements of the length yielded the following values 3.11 cm, 3.13 cm, 3.14 cm , 3.14 cm. Find the mean length, the mean absolute error and percentage error in the measured value of the length.

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`3.13 cm, 0.01cm, 1.3%`
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